Disclosed are 6-amido-3-substituted-1-azabicyclo[3.2.0]hept-2-en-7-one-2-carboxylic acids (I): STR1 wherein R1 is hydrogen or acyl; and X is halo, oxygen (the 2-3 bond is saturated and the species I exists as a carboxylate salt or ester), or --
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(2008/06/13)
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